简介:Theoxidationbehaviorofthreebiodieselsofdifferentorigins,viz.rapeseedoilderivedbiodiesel,soybeanoilderivedbiodieselandwasteoilbasedbiodiesel,weretestedonanoxidationtester.Thechemicalcompositionsofthebiodieselswerecharacterizedbygaschromatography.Thereafter,thestructuraltransformationoffattyacidmethylester(FAME)ofthebiodieselswasanalyzedbyaninfraredspectrometerandanultravioletabsorptionspectrometer.TheresultsdemonstratedthattheoxidationbehaviorofbiodieselsofdifferentoriginswascloselyrelatedtothecompositionanddistributionofFAMEs.HigherconcentrationofunsaturatedFAMEwithmulti-doublebondsexhibitedpooreroxidationresistance.Furthermore,cis-transisomerizationtransformationoccurredintheunsaturatedFAMEmoleculesandconjugateddouble-bondproducedduringtheoxidationprocessofbiodiesel.Greatercis-transvariationscorrespondedtodeeperoxidationdegree.ThehigherthecontentofunsaturatedFAMEwithmulti-doublebondsinabiodiesel,themoretheconjugateddoublebondswasformed.
简介:Inordertomeettheurgentneedforreducingolefincontentincrackednaphtha,theinfluenceoffeedstockcharacteristicsontheolefincontentwasdiscussed.ThedifferenttypesandperformanceofcatalystsdevelopedbyRIPPwereintroduced.Moreover,someeffectiveoperationapproachesincommercialunitswerepresentedtoserveasareferencetotherefinersforcatalystselection.
简介:TheSargentdividingwallcolumncanimplementfourproductsseparationsequencesinonecolumnbasedonFullyThermallyCoupledDistillationColumn.TheinitialdesignparametersarerequiredforthedesignoptimizationordynamiccontroloftheSargentdividingwallcolumn,andinordertomaketherigoroussimulationoftheSargentdividingwallcolumnmoreconducivetoconvergence,atencolumnmodelforcomplexSargentcolumnisestablishedinthispaper,andtheshortcutdesignmethodofthismodelisproposed.TheinternalminimumvaporandliquidflowareobtainedbytheUnderwoodequationsandthemassbalancemethodandtheV-minmethod.Theseparationfora4-componentshortcutmixtureofpentane,hexane,heptaneandoctanewasconsidered,whiletheinitialvaluesofdesignparametersandtheratioofvapor-liquiddistributionofeachcolumnwerecalculatedbyusingtheshortcutdesignmethodofatencolumnmodel.Andbycomparingtheshortcutcalculationswithrigoroussimulationresults,thepracticalityandreliabilityofshortcutcalculationswereverified.Thereasonforenergysavingwasanalyzedbasedonback-mixing.AvirtualheatexchangerisproposedtomaketheSargentdividingwallcolumnmoreenergyefficient.
简介:<正>TherulesofMIPreactionsforcatalyticcrackingofsulfurcompoundsanditsinfluenceonthesulfurcontentintheMIPnaphthawerestudied.ThemamfactorsinfluencingthesulfurcontentintheMIPnaphthawerethoughttobethesulfurcontentoffeedstockandwerecloselyrelatedwiththeolefincontentofnaphtha.TakingintoaccountthecharacteristicfeaturesofMIPprocess,themethodsforreducingthesulfurcontentintheMIPnaphthawerecomprisedofdecreasingthesulfurcontentoffeedstockbyhydrotreatinganddecreasingtheolefincontentofnaphthathroughpromotinghydrogentransferreactions.Therefore,theEuroⅣcleangasolinewithlowsulfurcontentandlowolefincontentcouldbeobtaineddirectlythroughtheMIPtechnology.
简介:甲醇储存损耗主要是储罐蒸发损耗中的“大、小呼吸”损耗。蒸发损耗的发生不仅造成大气污染,而且也造成极大的资源浪费。对引起储存损耗的原因进行了分析,并运用美国石油学会和中国石油化工系统关于储罐蒸发损耗量计算公式对甲醇储存损耗量进行计算和比较分析。在此基础上结合重庆川维物流有限公司甲醇储存系统的实际情况,提出了通过采用浮顶罐代替拱顶罐储存甲醇,储罐表面喷涂浅色涂层,水喷淋冷却等方法降低储存温度,以及采取安装废气回收装置和合理优化工艺等措施,降低甲醇的储存损耗。